Alesis D4 manual

Page 33

This chart represents three signals which are "seen" by the D4. Signal 1 is a legitimate hit from the snare pad. Signal 2 is the Tom 1 pad, but it is not a hit. It is the pad being triggered by stand vibrations from the first snare hit. Signal 3 is a second "real" hit from the snare pad.

As you can see the XTALK threshold is set at a value of 30 (represented by the dotted line). The two snare hits (signals 1 and 3) both register well above the XTALK threshold. However, the tom (signal 2) registers too soft (at 20), and is correctly ignored by the D4.

If the XTALK level had been set at an improper value (in this case lower than 20), signal 2 would exceed the XTALK threshold, and the D4 would have triggered the sound. This illustrates how proper adjustment of the XTALK parameter will result in the elimination of this "interaction" between the pads.

•DCAY. This parameter represents the signal decay time, or the amount of time between once a pad has been struck and triggers, to when it will trigger again from another hit. This is one of the more tricky issues of triggering. Here's why:

When hits are spaced 2 or more seconds apart, the first signal has plenty of time to decay completely, making it easy to determine the second signal as an actual hit. However, when playing quick, repetitive hits it is much more difficult to determine where one hit ends and the next one begins. To further complicate things, some drum sounds (especially acoustic drums) take a long time to decay. During this period, part of the decay can be interpreted as another closely-spaced hit.

This is where the DCAY control comes in. The DCAY control adjusts the time and threshold of the signal decay making it possible for the D4 to correctly determine whether closely spaced signals are "real" hits or just decay.

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Contents Alesis Drum SET Management Midi Functions Introduction Principal FeaturesHOOKUP/INSTANT Gratification Return Your Warranty Card NOW2B Hook Up Audio rear panel 2A Installation2C Hook Up Midi rear panel 2D Hook Up External Triggers rear panel2E Hook Up Power rear panel 2F Turn On Power2G Select Drum Sets 2H Audition Different Drum Sounds Page 3A The Voice 2I Assign Drum Sounds to Particular Midi Notes3C About Defaults 3B About the Edit Buffer3D Midi Note Range About the User Interface 4B Cursor Buttons 4A Function Buttons4C Multi-Page Functions 4D Editing Parameter Values4F The Preview Button 4E The Store and Note Chase buttonsSTORING/NAMING AN Edited Drum SET Selecting Drum SetsRecall Alesis Recalling Factory Drum SetsPage Voice Function ButtonsOutput TuneOutput Main Drum SETMode Multi EXT TrigGroup Button Midi Button Copying a Notes Parameters to Another NoteDrumset Root Drum SET Root Note Midi FunctionsTurn the Data wheel to select the desired Drum Set root note Midi Channel Selection Program Change EnableMidi THRU/OUT Selection Channel Omni Thru OFFProg Change on Controllers on Controller EnableMake sure the cursor is under the Controllers status Program Change Table Save Data VIA MidiProgram Table 6A Save to DataDisk 7A Load from DataDisk Receive Data from Another Midi DeviceExternal Triggering This is how it works About Trigger ParametersPage Example TRIG01 VCURVE4 Trigger SelectionTrigger Note Selection Trigger Velocity SelectionTRIG02 VCURVE4 Method One Page Trigger Crosstalk Selection Trigger Parameter SelectionTRIG02 XTALK30 DCAY10 NOISE00 TRIG03 XTALK30 DCAY10 NOISE00Page Trigger Noise Level Selection Trigger Dcay Control SelectionTRIG01 GAIN50 Trigger Gain SelectionFootswitch Mode HI HAT Pedal Footswitch Mode8A Understanding Hi Hat Pedal Mode Page Midi Hardware Midi BasicsMidi Message Basics Channel Messages3A Voice Messages Page System Common Messages 3B Mode MessagesVideos on Midi Books on Midi
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